#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("inversmodular.in");
ofstream fout("inversmodular.out");

int a,n;
long long inv=0,ins;

void invers(long long &x, long long &y, int a, int b)
{
    if(b==0)
    {
        x=1;
        y=0;
    }
    else
    {
        long long aux;
        invers(x,y,b,a%b);
        aux=x;
        x=y;
        y=aux-y*(a/b);
    }
}

int main()
{
    fin>>a>>n;
    invers(inv,ins,a,n);
    if(inv<=0)
        inv=n+inv%n;
    fout<<inv;


    return 0;
}